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Moved from General because I had no responses and this seems to be a better place for this question....

Hi All
I have recently started working with an EthernetIP to Modbus translation module which I am trying to use with a P1-540 PLC ( firmware 1.2.5.38 ) in conjunction with the Productivity Suite (V3.2.1.4). For several reasons I need to only use the Explicit unconnected messages to interact this module and I have successfully managed to do it using the Molex Ethernet/IP Tools GUI. The module implements the CIP Modbus class, however it needs to encapsulated in a Forward Open packet to be used.
So in the Molex Explicit Message tab, I have add extra route path of 3 and 1 in the unconnected send which results in the successfull Forward Open port call.

So here is my problem. To get the PLC to work I somehow need to add this extra path info but I do not know how.

Here is a successful request originating from the Molex gui (wireshark sniffed), selecting the modbus object and holding register service as well as the forward open

I have underlined the Forward Open part of the telegram that is included in the first successful telegram and made bold the Modbus class common path. I need to somehow add the Forward Open path into the second (PLC) .

Please does anyone know how I achieve this please. Is there a hidden open either in the EIP device setup or in the EMSG instruction.